中国特有属藤山柳属 (猕猴桃科) 的花粉形态及其分类学意义

摘要：藤山柳属Clematoclethra为中国特有属，属内物种划分争议颇大。利用扫描电镜观察了该属14个居群的花粉形态，结果表明藤山柳属的花粉为小粒花粉，多为圆球形，具三拟孔沟，根据外壁纹饰可分为皱波状花粉、颗粒状花粉和细疣状花粉3种类型。花粉类型与植株毛被特征有一定相关性，对澄清藤山柳属的分类问题具有一定意义。

Pollen Morphology of the Chinese Endemic Clematoclethra (Actinidiaceae) and Its Taxonomic Implications

The genus Clematoclethra (Franch.) Maxim. (Actinidiaceae) is endemic in the temperate and subtropical regions in central and western China. Species delimitation in the genus has been highly controversial. It has been treated as including 20 species and four varieties or only one species (Cscandens) with four subspecies. In this paper, pollen grains of 15 individuals from 14 populations representing the genus Clematoclethra were examined under scanning electronic microscope (SEM). The pollen is small sized, usually spheroidal in shape, sometimes subprolate and prolate, with the aperture 3 colporoidate, and falls into three types in respect of exine sculpture, namely, rugulate, granulate, and finely verrucate. The types of pollen are somewhat correlated with the types of indumentum of plants, indicating that pollen morphology is helpful for the classification of Clematoclethra.